[swift-users] SwiftProtobuf unable to link on Ubuntu

Geordie J geojay at gmail.com
Sat Oct 14 15:00:16 CDT 2017


> Am 14.10.2017 um 21:55 schrieb Edward Connell via swift-users <swift-users at swift.org>:
> Has anyone used the SwiftProtobuf module on Linux?
> https://github.com/apple/swift-protobuf <https://github.com/apple/swift-protobuf>
> I am able to successfully generate swift classes from my proto file.
> However when building, the code compiles but I get a ton of undefined link references.
> I included -Xswiftc -I/home/ed/swift-protobuf/.build/release so the module is found, but still….

This should be "-Xlinker” rather than “-Xswiftc”, and also “-l” is for specifying system library names (e.g. "-latomic”). I’m pretty new to this but I think the correct flag is “-L”.
So in the past I have used “-Xlinker -L/path/to/libs”, but I’ve recently read you can actually leave off “-Xlinker” and just have the “-L” bit.

Hope that helps.

- Geordie

> ------------------------
> /home/ed/Documents/prototest/Sources/DataModel.pb.swift:31: error: undefined reference to '_T013SwiftProtobuf14UnknownStorageVACycfC'
> /home/ed/Documents/prototest/Sources/DataModel.pb.swift:31: error: undefined reference to '_T013SwiftProtobuf14UnknownStorageVACycfC'
> /home/ed/Documents/prototest/Sources/DataModel.pb.swift:64: error: undefined reference to '_T013SwiftProtobuf14UnknownStorageV8traverseyxz7visitor_tKAA7VisitorRzlF'
> /home/ed/Documents/prototest/Sources/DataModel.pb.swift:0: error: undefined reference to '_T013SwiftProtobuf7MessagePAAE13isInitializedSbfg'
> etc...
> Does anyone have a simple working example on Ubuntu?
> Ubuntu 16.04
> Swift 4.0 release
> Thanks, Ed
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